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Opening Snap and Second Heart Sound Reference Guide

Opening Snap and Second Heart Sound

An opening snap occurring early in diastole along with a single second heart sound can mimic a split second heart sound. An opening snap is caused by thickened valve leaflets. When they open, it produces a snapping sound. The more severe the thickening the earlier in diastole the opening snap occurs. In this example you are hearing an opening snap, which occurs 75 milliseconds after the start of the second heart sound.


Auscultation Sound From Lesson

auscultation sound from lesson
waveform


Patient Recording

patient heart or lung sound
Opening Snap and Second Heart Sound


Patient Recording - Half Speed Playback

patient heart or lung sound
Opening Snap and Second Heart Sound


Position

Patient position
The patient's position should be supine.

Listening Tips

Diastole:Snap early in diastole, higher-pitch than S2


Waveform (Phonocardiogram)





Observe Cardiac Animation

An opening snap is caused by thickened valve leaflets. When they open it, produces a snapping sound. The more severe the thickening the earlier in diastole the opening snap occurs. In this example you are hearing an opening snap which occurs 75 milliseconds after the start of the second heart sound.


Authors and Sources

Authors and Reviewers


Sources



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Opening Snap and Second Heart Sound | Description, Audio and Animations | #52
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